Sustainable habitats play a significant role in determining the survival and habitat preservation of endangered species. To conserve the endangered species <i>Iris dichotoma</i> Pall. and its habitat in Taeanhaean National Park, we collected seeds from a natural population and germinated and propagated them in a greenhouse. In 2019, the propagated individuals of <i>I. dichotoma</i> were transplanted at two study sites in Taeanhaean National Park. After conservation translocation, annual monitoring was conducted from 2020 to 2022, and factors related to the survival and growth of <i>I. dichotoma</i> (clonal propagation rate [%], the flowering rate [%], the population density [individual/m<sup>2</sup>], the maximum leaf bundle length [height; cm], the maximum leaf bundle width [cm], and the pedicel length [cm]) were measured. According to the results of the monitoring of the flowering and fruiting periods for three years after transplantation, 82.4% of individuals in total were found to have survived. During 2020 to 2022, the mean population density (individual/m<sup>2</sup>) increased from 0.36 to 0.42 and the size of the leaf bundle length and the width both decreased compared to the corresponding figures in 2019 (p < 0.05). According to the findings here, the transplanted population of <i>I. dichotoma</i> is considered to have adapted successfully to its new site in Taeanhaean National Park.